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Q. Common causes related with angina pectoris?
• The usual cause of angina is the narrowing of the major coronary artery due to atherosclerosis.
• Systemic hypertension increases myocardial demand and if the supply of blood to the heart muscles is less, it can cause angina.
• Heart disease: In late stages of aortic stenosis (narrowing of aorta) it can precipitate an anginal attack.
• Anaemia: The heart gets less oxygen due to lack of haemoglobin in anaemia.
How is the circulatory system of birds characterized? Birds, as every vertebrate, have a closed circulatory system. The heart is same to the mammalian heart, having four chambe
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Setting priorities for action: It is not enough for our actions to be coordinated with events in the outside world; they must reflect our internal needs. Pain can flood conscious
Q Does RNA molecule have two polynucleotide chains like the DNA? Only DNA has two polynucleotide chains. The RNA is formed by just one polynucleotide chain.
What are cytokinins? Where are they made? Cytokinins are phytohormones active in the promotion of cellular division; they slow down the aging of tissues and act together with a
function of epithelial tissue
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